These are from a full size Gen 5 so they’re only going to work with models 17Gen5 19Gen5 22Gen5 23Gen5 26Gen5 27Gen5 34Gen5 35Gen5 or 45/19X. The internals were refined from previous generations but are not backwards compatible. Parts include striker, extractor, extractor depressor plunger, firing channel safety & spring, and the rear slide plate cover.